But at the bottom of the Great Blue Hole was the most shocking discovery of all — human rubbish. Branson's team found a two-litre Coke bottle that had made its way 124 metres deep, as well as a lost GoPro camera full of someone's holiday photos.
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A blue hole can be an oasis in an otherwise barren seafloor. Blue holes are diverse biological communities full of marine life, including corals, sponges, mollusks, sea turtles, sharks, and more. The seawater chemistry in the holes is unique and appears to interact with groundwater and possibly aquifer layers.
You don't need to be a recreational diver to travel to the Great Blue Hole to take in all that it has to offer. The experience can be just as magical and unique. You can still swim in the beautiful calm blue water and appreciate how lucky you are to visit such an incredible destination.
Option 2: Scuba diving in the Great Blue Hole Belize. The other way to experience the Great Blue Hole Belize is by scuba diving inside the hole. This of course gives you the experience of seeing inside this incredible sinkhole, not viewing it from above.
Within this small sea of light colors, however, lies a giant circle of deep blue. Roughly 300 meters (1,000 feet) across and 125 meters (400 feet) deep, the feature is known as the Great Blue Hole.
Underneath the surface of the Belize Blue Hole, the explorers found evidence of a hollow interior filled with stalactites and stalagmites. These stalactites acted as veritable proof for the explorers to conclude that the Hole was a swallow hole.
Believed to be the world's largest feature of its kind, the Great Blue Hole is part of the larger Belize Barrier Reef Reserve System, a World Heritage site of the United Nations Educational, Scientific and Cultural Organization (UNESCO).
Tourism. The Great Blue Hole is a popular spot among recreational scuba divers who are lured by the opportunity to dive in sometimes crystal-clear water and meet several species of fish, including midnight parrotfish, Caribbean reef shark, and other juvenile fish species.